Rack promotion

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Loaded conveyor frame

In the mining industry, frame conveyance is a type of shaft conveyance . Here, at the will route promoting used trolley to a conveying stand is pushed and to it by the manhole promoted. The rack conveyance is a discontinuous conveyance. It is a good multi-purpose conveyor suitable for multi-sole operation.

Basics

In the case of frame conveying, the conveying frames hang on the hoisting rope and are moved by the hoisting machine via this . With this type of shaft hoisting, the dead load is around 65 percent and the payload is around 35 percent. There are conveyor racks with one or more floors. There are also frame conveyors in which several trolleys can be pushed onto a frame base. The carriages are then pushed onto the support floor next to one another or one behind the other. With such rack conveyors, a larger payload can be moved through the shaft. The ratio between the dead load and the payload is thereby improved. However, larger shaft diameters are required for these frame conveyors than for container conveyance with the same output. The best way to carry out the cable car ride is with the rack conveyor .

Shaft loading

Rack conveyance in the filling location

In the case of rack conveyance, the conveyor racks can be loaded on one or both sides. With one-sided loading, the trolleys are pushed off the conveyor frame from one side and pushed back on from the same side. With two-sided loading, the trolleys are pushed onto the conveyor cage on one side and the trolley on the frame is pushed off on the opposite side. This form of shaft loading is known as push-through conveying. While the one-sided conveyance is only used with weak conveyance, the push-through conveyance is used with mass conveyance. The shaft loading takes about 45 percent of the conveying time of each conveying cycle.

When loading the individual shelves, there are three ways of pushing the trolleys off or on. Either each shelf is loaded individually and one after the other, all shelves are loaded at the same time, or the shelves are loaded in groups. In the case of simultaneous and group-wise loading of the load-bearing shelves, the suspended bench and the filling point must be equipped with platforms and an associated carriage circuit . If the shelves are loaded individually, the conveyor frame must be moved. Congestions in the supply at the filling point or on the hanging bank lead to waiting times and delivery failures.

There are two operating methods when moving, the German and the American operating method. The German operation process on the pit bank of the lowest rack tray first charged, then the other trays. At the filling point, the topmost load-bearing floor is therefore loaded first. With the American operating procedure it is the other way round. With the German operating method, the risk of exaggeration is greater than with the American operating method. So that the trolleys can be pushed from the base onto the supporting floor, the conveyor frame must either be placed on a mounting device or loaded using a swinging platform. When loading by means of a placement device, there is a risk that the conveyor frame will be compressed with each placement process.

application

The rack conveyance was mainly used in the coal mining for shaft conveyance. This was initially due to the fact that the aim was to extract as much lump coal as possible . Since the loaded trolleys at the shaft no longer have to be reloaded into the conveyed goods carrier, the pieces of coal are no longer crushed. However, these requirements no longer play a major role today, as there are now hardly any price differences between lump coal and fine coal. The omission of the reloading process also avoids further dust formation. In addition, many mines in the Ruhr area mined several types of coal , each of which had to be allocated to a separate line in the coal washing plant. This is easier to handle due to the rack conveyor. A special form of rack conveyance was used in American mining for deep shafts. In this frame conveyor, known as tandem conveyor, two conveyor frames were attached to a rope. In the middle of the shaft, the cars were changed on a midsole.

Individual evidence

  1. ^ A b Walter Bischoff , Heinz Bramann, Westfälische Berggewerkschaftskasse Bochum: The small mining dictionary . 7th edition, Verlag Glückauf GmbH, Essen 1988, ISBN 3-7739-0501-7 .
  2. ↑ a b c d e f Fritz Heise, Fritz Herbst: Textbook of mining studies with a special focus on hard coal mining. Second volume, fifth increased and improved edition, published by Julius Springer, Berlin 1932, pp. 564, 572, 587-588, 636, 648.
  3. ↑ Ernst-Ulrich Reuther: Introduction to mining. 1st edition, Verlag Glückauf GmbH, Essen, 1982, ISBN 3-7739-0390-1 , pp. 35-39.
  4. ↑ a b c d e Horst Roschlau, Wolfram Heinze, SDAG Wismut (Hrsg.): Knowledge storage mining technology. 1st edition. German publishing house for basic industry, Leipzig 1974, p. 182.
  5. ↑ a b c d e f g h i Carl Hellmut Fritzsche: Textbook of mining science. First volume, 10th edition, Springer Verlag, Berlin / Göttingen / Heidelberg 1962, pp. 452–462.
  6. ↑ a b c d e Hans Bansen (Ed.): The mining machines . Fourth volume, The shaft production. Published by Julius Springer, Berlin 1913, pp. 212-229.
  7. ↑ European patent application, shaft hoisting system . Patent number 80106724.0, November 1, 1980.